Nebraska's depth has once again been challenged, and the season hasn't officially started yet.

Projected starting offensive lineman Jerald Foster won't play a single snap this season, the university announced, after tearing a knee ligament in practice this week. It will require surgery, head coach Mike Riley added.

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The Lincoln native played in 13 games a season ago, primarily in special teams sets, and appeared to be the starting left guard, tasked with protecting Tommy Armstrong Jr.'s blind side.

That position is likely to now to be filled by Corey Whitaker, who recently had minor knee surgery. Freshman Boe Wilson or redshirt freshman Jalin Barnett may also fill in.